ins.as, ins.rs1, ins.rs2, ins.imm = AZEXTH, uint32(p.From.Reg), obj.REG_NONE, 0
				if p.As == AMOVWU {
					ins.as, ins.rs2 = AADDUW, REG_ZERO
				}
			} else {
				// Use SLLI/SRLI sequence to extend.
				ins.as, ins.rs1, ins.rs2 = ASLLI, uint32(p.From.Reg), obj.REG_NONE
				if p.As == AMOVHU {
					ins.imm = 48
				} else if p.As == AMOVWU {
					ins.imm = 32
				}